Distribution characteristics of water-soluble ions during a haze pollution process in Nanjing
LIU An-kang1, WANG Hong-lei1,2, CHEN Kui1, LU Wen1, SHI Shuang-shuang1, LIU Zhen3
1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China;
2. Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Shanghai 200433, China;
3. Qinhuangdao Meteorological Bureau, Qinhuangdao 066000, China
The composition of PM2.5 was monitored online continuously by using MARGA 1S Analyzer ADI 2080 in Nanjing from December 27, 2017 to January 5, 2018. Combined with meteorological elements and atmospheric environmental monitoring data, the time distribution and source characteristics of water-soluble ions in haze pollution process was investigated. The mass concentration of water-soluble ions in Nanjing during the haze pollution was 121.41μg/m3, 3.2 times of the level in clean days. The order of the average mass concentration of water-soluble ions in the haze pollution process was NO3- > SO42- > NH4+ > Cl- > K+ > Ca2+ > Mg2+. SO42-, NO3- and NH4+ accounted for 91.97% of the total water-soluble ions concentration. The diurnal variations of water-soluble ions in haze days were all trimodal, while in clean days, Cl-, SO42- and NH4- were unimodal, Ca2+ was bimodal, K+ and Mg2+ were trimodal. With the aggravation of the air pollution, the proportion of total water-soluble ions in PM2.5 was decreasing. When the air quality was excellent, the proportion was 95.93%, while it was 63.25% when serious pollution occurred. With the increase of pollution in haze days, the proportion of NH4+ to total water-soluble ions was stable at around 23%, the proportion of SO42- decreased slowly, and the proportion of NO3- increased continuously. The diurnal variations of NOR and SOR were bimodal in haze days, while in clear days, they were relatively stable. During the observation period, water-soluble ions were derived mainly from secondary conversion, coal ash, dust, and biomass combustion.
刘安康, 王红磊, 陈魁, 卢文, 施双双, 刘贞. 南京市一次霾污染过程中水溶性离子分布特征[J]. 中国环境科学, 2019, 39(5): 1793-1803.
LIU An-kang, WANG Hong-lei, CHEN Kui, LU Wen, SHI Shuang-shuang, LIU Zhen. Distribution characteristics of water-soluble ions during a haze pollution process in Nanjing. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1793-1803.
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